BILLERICA -- Police have arrested the second suspect who allegedly robbed a Dunkin' Donuts after choking one of the store's employees on April 4, according to Lt. Roy Frost.

On Wednesday, Billerica police arrested Joseph Sullivan, 25, of Nashua, N.H., on a warrant for assault with the intent to murder and unarmed robbery at 459 Boston Road, Frost said. He was initially arrested on April 9 in a Nashua Motel 6 but was extradited to Massachusetts on Wednesday.

On April 4 at 10:30 p.m., Billerica police responded to a robbery at Dunkin' Donuts . Shortly after the store closed, two suspects forced their way into the restaurant while employees were still there, Frost said.

Nicholas Carter, 27, of Northwood, N.H., was arrested by Northwood police on April 9 and was extradited to Massachusetts for an April 18 arraignment.

When they were both initially arrested on April 9 as fugitives from justice, they pleaded not guilty to the charges.

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